mileage
Word family
Synonym discussion
Sense: noun/1
While all four terms relate to how far a vehicle has travelled, 'mileage' is the broadest and most common everyday word — it refers to the total miles driven, and can also double as a measure of fuel economy (sense 2). 'Distance' is more general and can apply to anything from walking to space travel, whereas 'mileage' is tied specifically to vehicles and road travel. 'Mileage reading' or 'odometer reading' refer to the exact number displayed on a car's dashboard at a given moment. For example, you might say 'the car has low mileage' (condition), but 'what does the mileage reading say?' (checking the exact number before a trip).
Etymology
Formed in English around the 1750s by combining 'mile' (the unit of distance, from Latin 'mille passus' meaning a thousand paces) with the suffix '-age' (which turns a measure into a quantity or rate). Originally it simply meant 'distance in miles.' The figurative sense of 'advantage or benefit obtained' emerged in American English in the mid-1900s, likely from the idea of 'getting the most distance (and therefore value) out of something'.